I use this power supply:
Power: 72Watt Output Voltage: 12V DC Output Current: 6Amp Supply Voltage: 120...373V DC 88...264V AC Protection: overload short-circuit voltage growth Number of Outputs: 1
and at the output I have connected this dc2dc step down power converter: Features: 1. In+: Input positive 2. Out+: Output positive 3. GND: IN-/OUT- 4. Dimension:45*31*16mm(length*width*height) 5. Input voltage: 9-35V(Maximum limit voltage is 35V, please leave some leeway to use ,otherwise be damaged) 6. Output voltage: 5V 7. Output current: 5A 8. Output power: 25W
I measured 11.1 Volt in the output of the power supply (which is also the input to the DC2DC converter) and I measured 4,65 Volt in the output of the output of the dc2dc converter. It should show 5 Volt. I use 1,5 mm^2 cables all inside the circuit and the connections, 3 pads for the conductors in the proto board and the supply network is 220Volt/50Hz. What could be wrong??